linux-kernel - Re: Use of directories to hold root?

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Message-ID: <Pine.LNX.4.64.0708122253360.28963@fbirervta.pbzchgretzou.qr>
Date:	Sun, 12 Aug 2007 22:55:56 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Al Viro <viro@....linux.org.uk>
cc:	Mark Cannon <random.bits@...ers.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: Use of directories to hold root?


On Aug 12 2007 21:23, Al Viro wrote:
>> 
>> pivot_root is atomic afaict, for `mount --move` (which I think Al meant 
>> which MS_MOVE - or some C program using mount(2) of your own), you'd 
>> need multiple calls to mount.
>
>Move itself is done by a single syscall anyway...
>
Yes, but you need needed 2 mounts, 1 chdir and one chroot. Plus, you 
have not freed the data in the rootfs. (Well, neither does 
pivot_root, but run-init from klibc will.)


	Jan
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